<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>盒子模型-边框线</title>
  <style>
    div {
      width: 200px;
      height: 200px;
      background-color: pink;
      
      /* 实线 */
      /* border: 1px solid #000; */

      /* 选线 */
      /* border: 2px dashed red; */

      /* 点线 */
      border: 3px dotted green;
    }
  </style>
</head>
<body>
  <!-- 
    属性名: border(简写bd)
    属性值: 边框线粗细 线条样式 颜色 (不区分顺序)
    常用线条样式:
      solid: 实线
      dashed: 虚线
      dotted: 点线
   -->
   <div>div 标签</div>
</body>
</html>